Dynamic pressure gas suspension centrifugal refrigeration compressor and its axial bearing cavity drainage structure

Abstract

The present application discloses a dynamic pressure gas suspension centrifugal refrigeration compressor and its axial bearing cavity drainage structure. The drainage structure includes: a drainage channel, the first end of which is connected to the bearing cavity, the second end of which is connected to the motor cavity, and the position of the first end is higher than the position of the second end; a one-way flow guide, which is located in the drainage channel, and the one-way flow guide guides the liquid refrigerant in the bearing cavity to flow unidirectionally to the motor cavity. The present application solves the technical problem in the related art that the axial bearing cavity of the dynamic pressure gas suspension centrifugal refrigeration compressor cannot be drained.

Description

Technical Field

[0001] The present application relates to the technical field of compressors, and in particular to a dynamic pressure gas suspension centrifugal refrigeration compressor and an axial bearing cavity drainage structure thereof. Background Art

[0002] At present, the thrust plate of the dynamic pressure gas suspension centrifugal refrigeration compressor is located in the chamber of the axial bearing. When the compressor is stopped, condensed liquid refrigerant is likely to appear in the axial bearing chamber. When the refrigerant level is higher than the lower surface of the thrust plate, it is easy for the bearing surface to be affected by the liquid refrigerant when it is turned on, and it is impossible to form a stable air film, which in turn affects the performance of the compressor. In traditional dynamic pressure gas suspension centrifugal refrigeration compressors, this axial bearing chamber does not have a special drainage structure, or directly connects this chamber to the motor chamber. However, when it is directly connected, the liquid refrigerant in the motor chamber is easy to flow back to the bearing chamber when it is turned on, causing the bearing to become unstable.

[0003] With regard to the problem in the related art that the axial bearing cavity of the dynamic pressure gas suspension centrifugal refrigeration compressor cannot be drained, no effective solution has been proposed yet. Summary of the invention

[0004] The main purpose of the present application is to provide a dynamic pressure gas suspension centrifugal refrigeration compressor and its axial bearing cavity drainage structure, so as to solve the problem that the axial bearing cavity of the dynamic pressure gas suspension centrifugal refrigeration compressor cannot be drained in the related art.

[0005] In order to achieve the above-mentioned objectives, the present application provides a dynamic pressure gas suspension centrifugal refrigeration compressor and an axial bearing cavity drainage structure thereof.

[0006] The dynamic pressure gas suspension centrifugal refrigeration compressor and the axial bearing cavity liquid discharge structure thereof according to the present application include:

[0007] A drainage channel, wherein a first end is connected to the bearing cavity, a second end is connected to the motor cavity, and a position of the first end is higher than a position of the second end;

[0008] A one-way flow guide is located in the drainage channel, and the one-way flow guide guides the drainage channel so that the liquid refrigerant in the bearing cavity flows unidirectionally to the motor cavity.

[0009] Optionally, the drainage channel includes a primary throttling hole and a secondary throttling hole, the upper end of the primary throttling hole is connected to the bearing cavity, the one-way flow guide is located at the lower end of the primary throttling hole, one end of the secondary throttling hole is connected to the lower end of the primary throttling hole, and the other end of the secondary throttling hole is connected to the motor cavity.

[0010] Optionally, the first-stage throttling hole is a stepped hole, the inner diameter of the upper end hole of the stepped hole is smaller than the inner diameter of the lower end hole, the one-way flow guide is located in the lower end hole, and one end of the second-stage throttling hole is connected to the lower end hole.

[0011] Optionally, the one-way flow guide includes a float having a diameter larger than an inner diameter of the upper end hole. When the liquid level of the liquid refrigerant in the lower end hole is higher than a connecting position where one end of the secondary throttling hole is connected to the lower end hole, the float is sealed between the upper end hole and the connecting position to limit the liquid refrigerant in the motor cavity from flowing to the bearing cavity.

[0012] Optionally, a plug is further included, the lower end of the lower end hole is exposed to the outside of the dynamic pressure gas suspension centrifugal refrigeration compressor, and the plug is sealed at the lower end of the lower end hole.

[0013] Optionally, the secondary throttling hole is a stepped hole, the inner diameter of the small hole end of the stepped hole is smaller than the inner diameter of the large hole end, the small hole end is connected to the lower end hole, and the inner diameter of the small hole end is smaller than the diameter of the float.

[0014] Optionally, it further includes an air return hole connected to the motor cavity, the air return hole is located on a side of the motor cavity close to the drainage channel, and the position where the air return hole connects to the motor cavity is lower than the second end of the drainage channel.

[0015] In a second aspect, the present application further provides a dynamic pressure gas suspension centrifugal refrigeration compressor, including the above-mentioned dynamic pressure gas suspension centrifugal refrigeration compressor axial bearing cavity drainage structure.

[0016] Optionally, it further includes a housing, a first-stage impeller, a stepped shaft, a thrust plate, a first bearing body and a second bearing body;

[0017] The first-stage impeller is installed on one side of the stepped shaft, the second bearing body is arranged between the housing and the first bearing body, the first bearing body is sleeved on the first-stage impeller, the bearing cavity is located between the first bearing body and the second bearing body, the thrust plate is located in the bearing cavity, the thrust plate and the second bearing body are both sleeved on the stepped shaft, the motor cavity is arranged in the housing, and the bearing cavity and the motor cavity are located between the second bearing body.

[0018] Optionally, it further includes a motor stator and a motor rotor, the motor rotor is arranged on the stepped shaft, the motor rotor and the stepped shaft can be an integral structure, the motor stator is fixed in the shell, and the motor stator and the motor rotor are both located in the motor cavity.

[0019] In an embodiment of the present application, a dynamic pressure gas suspension centrifugal refrigeration compressor and its axial bearing cavity drainage structure are provided, by setting: a drainage channel, the first end of which is connected to the bearing cavity, the second end of which is connected to the motor cavity, and the position of the first end is higher than the position of the second end; a one-way flow guide, which is located in the drainage channel, and the one-way flow guide guides the liquid refrigerant in the bearing cavity to flow unidirectionally to the motor cavity. In this way, since the position of the first end of the drainage channel is higher than the position of the second end, the liquid refrigerant in the bearing cavity flows to the motor cavity through the drainage channel, and through the one-way flow guide arranged in the drainage channel, the liquid refrigerant cannot flow back from the motor cavity to the bearing cavity after the compressor is turned on, thereby achieving the purpose of effective drainage of the bearing cavity and effectively ensuring the normal operation of the compressor. Thereby solving the technical problem that the axial bearing cavity of the dynamic pressure gas suspension centrifugal refrigeration compressor cannot be drained in the related art. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings constituting a part of this application are used to provide a further understanding of this application, so that other features, purposes and advantages of this application become more obvious. The schematic embodiment drawings and their descriptions of this application are used to explain this application and do not constitute an improper limitation on this application. In the drawings:

[0021] Figure 1 It is a structural schematic diagram of a fluid discharge structure of an axial bearing cavity of a dynamic pressure gas suspension centrifugal refrigeration compressor provided in an embodiment of the present application. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0023] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0024] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0025] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0026] In addition, the terms "installed", "set", "provided with", "connected", "slidingly connected", and "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0027] In addition, the term "plurality" shall mean two or more.

[0028] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0029] like Figure 1 As shown, the embodiment of the present application provides a dynamic pressure gas suspension centrifugal refrigeration compressor and an axial bearing cavity drainage structure thereof, including:

[0030] A drainage channel, wherein a first end is connected to the bearing cavity 16 and a second end is connected to the motor cavity 17, and a position of the first end is higher than a position of the second end;

[0031] A one-way flow guide is located in the drainage channel, and the one-way flow guide guides the drainage channel so that the liquid refrigerant in the bearing chamber 16 flows to the motor chamber 17 in one direction.

[0032] Specifically, since the position of the first end of the drainage channel is higher than the position of the second end, the liquid refrigerant in the bearing cavity 16 flows to the motor cavity 17 through the drainage channel, and the one-way flow guide member provided in the drainage channel prevents the liquid refrigerant from flowing back from the motor cavity 17 to the bearing cavity 16 after the compressor is turned on, thereby achieving the purpose of effectively draining the bearing cavity 16 and effectively ensuring the normal operation of the compressor. This solves the technical problem in the related art that the axial bearing cavity 16 of the dynamic pressure gas suspension centrifugal refrigeration compressor cannot be drained.

[0033] Optionally, the drainage channel includes a primary throttling hole 11 and a secondary throttling hole 14, the upper end of the primary throttling hole 11 is connected to the bearing cavity 16, the one-way flow guide is located at the lower end of the primary throttling hole 11, one end of the secondary throttling hole 14 is connected to the lower end of the primary throttling hole 11, and the other end of the secondary throttling hole 14 is connected to the motor cavity 17.

[0034] Specifically, the liquid refrigerant in the bearing cavity 16 will enter the secondary throttling hole 14 through the primary throttling hole 11 , and then enter the motor cavity 17 through the secondary throttling hole 14 .

[0035] Optionally, the first-stage throttling hole 11 is a stepped hole, the inner diameter of the upper end hole of the stepped hole is smaller than the inner diameter of the lower end hole, the one-way flow guide is located in the lower end hole, and one end of the second-stage throttling hole 14 is connected to the lower end hole.

[0036] Specifically, the first-stage throttling hole 11 is a stepped hole, and the one-way flow guide is located in the lower end hole of the stepped hole, and the inner hole diameter of the upper end hole of the stepped hole is smaller than the inner hole diameter of the lower end hole, so that the one-way flow guide will not enter the bearing cavity 16.

[0037] Specifically, the one-way flow guide includes a float 12, the diameter of the float 12 is larger than the inner diameter of the upper end hole. When the liquid level of the liquid refrigerant in the lower end hole is higher than the connecting position where one end of the secondary throttling hole 14 is connected to the lower end hole, the float 12 is blocked between the upper end hole and the connecting position to limit the liquid refrigerant in the motor cavity 17 from flowing to the bearing cavity 16.

[0038] The top shape of the lower end hole of the stepped hole is a curved surface matching the float 12, so that when the float 12 floats to the top of the lower end hole, the surface of the float 12 can fit on the curved surface, thereby better enabling the float 12 to block the conduction from the lower end hole to the upper end hole. Thus, the float 12 has the one-way conduction function of a one-way flow guide.

[0039] Optionally, a plug 13 is further included, the lower end of the lower end hole is exposed to the outside of the dynamic pressure gas suspension centrifugal refrigeration compressor, and the plug 13 is sealed at the lower end of the lower end hole.

[0040] Specifically, by setting the plug 13, the installation of the float 12 can be realized and the float 12 can float in the lower end hole, so that the float 12 has the unidirectional conduction function of a unidirectional flow guide. Moreover, the plug 13 can also be used to open the plug 13 for draining when manual draining is required.

[0041] Optionally, the secondary throttling hole 14 is a stepped hole, the inner diameter of the small hole end of the stepped hole is smaller than the inner diameter of the large hole end, the small hole end is connected to the lower end hole, and the inner diameter of the small hole end is smaller than the diameter of the float 12.

[0042] Specifically, the secondary throttling hole 14 is a stepped hole, which is convenient for machining the secondary throttling hole 14 and can prevent the float 12 from entering the motor cavity 17 through the secondary throttling hole 14 .

[0043] Optionally, it further includes an air return hole 15 connected to the motor cavity 17, the air return hole 15 is located on a side of the motor cavity 17 close to the drainage channel, and the position where the air return hole 15 connects to the motor cavity 17 is lower than the second end of the drainage channel.

[0044] Specifically, the air return hole 15 is located on one side of the motor cavity 17 close to the drainage channel, so that the liquid refrigerant discharged from the drainage channel can be discharged from the motor cavity 17 through the air return hole 15 in time, and the air return hole 15 is connected to the evaporator, so that the liquid refrigerant can be circulated.

[0045] In a second aspect, the present application further provides a dynamic pressure gas suspension centrifugal refrigeration compressor, including the above-mentioned dynamic pressure gas suspension centrifugal refrigeration compressor axial bearing cavity drainage structure.

[0046] Optionally, it further includes a housing 7, a primary impeller 1, a stepped shaft 6, a thrust plate 4, a first bearing body 2 and a second bearing body 3;

[0047] The first-stage impeller 1 is installed on one side of the stepped shaft 6, the second bearing body 3 is arranged between the housing 7 and the first bearing body 2, the first bearing body 2 is sleeved on the first-stage impeller 1, the bearing cavity 16 is located between the first bearing body 2 and the second bearing body 3, the thrust plate 4 is located in the bearing cavity 16, the thrust plate 4 and the second bearing body 3 are both sleeved on the stepped shaft 6, the motor cavity 17 is arranged in the housing 7, and the bearing cavity 16 and the motor cavity 17 are located between the second bearing body 3.

[0048] The primary throttling hole 11 and the secondary throttling hole 14 are both arranged on the second bearing body 3 , and the air return hole 15 is arranged on the housing 7 .

[0049] Optionally, it also includes a motor stator 5 and a motor rotor, the motor rotor is arranged on the stepped shaft 6, the motor rotor and the stepped shaft 6 can be an integral structure, the motor stator 5 is fixed in the housing 7, and the motor stator 5 and the motor rotor are both located in the motor cavity 17.

[0050] Optionally, it also includes a radial bearing 8, a radial bearing mounting seat 9 and a secondary impeller 10, the secondary impeller 10 is installed at the end of the stepped shaft 6 away from the primary impeller 1, the radial bearing 8 and the radial bearing mounting seat 9 are both sleeved on the stepped shaft 6, and the radial bearing mounting seat 9 is connected to the housing 7, and the radial bearing mounting seat 9 is located between the radial bearing 8 and the secondary impeller 10.

[0051] The working principle of the embodiment of the present application is as follows:

[0052] When the compressor is stopped, the liquid refrigerant in the motor cavity 17 returns to the evaporator from the return air port. When there is condensed liquid refrigerant in the bearing cavity 16, the liquid refrigerant will flow into the motor cavity 17 from the primary throttle hole 11 and the secondary throttle hole 14, so as to avoid the liquid refrigerant in the bearing cavity 16 causing the bearing to be unstable when the compressor is started.

[0053] When the compressor is turned on, if there is liquid refrigerant in the motor cavity 17 , the liquid refrigerant will flow through the secondary throttling hole 14 and cause the float 12 to float up and block the primary throttling hole 11 , thereby preventing the liquid refrigerant from entering the bearing cavity 16 .

[0054] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A liquid discharge structure for the axial bearing cavity of a dynamic pressure gas suspension centrifugal refrigeration compressor, characterized in that: include: A drainage channel, wherein a first end is connected to the bearing cavity, a second end is connected to the motor cavity, and a position of the first end is higher than a position of the second end; A one-way flow guide member is located in the drainage channel, and the one-way flow guide member guides the liquid refrigerant in the drainage channel so that the liquid refrigerant in the bearing cavity flows unidirectionally to the motor cavity; The drainage channel includes a primary throttle hole and a secondary throttle hole, the upper end of the primary throttle hole is connected to the bearing cavity, the one-way flow guide is located at the lower end of the primary throttle hole, one end of the secondary throttle hole is connected to the lower end of the primary throttle hole, and the other end of the secondary throttle hole is connected to the motor cavity; The primary throttling hole is a stepped hole, the inner diameter of the upper end hole of the stepped hole is smaller than the inner diameter of the lower end hole, the one-way flow guide is located in the lower end hole, and one end of the secondary throttling hole is connected to the lower end hole; The one-way flow guide comprises a float ball, the diameter of which is larger than the inner diameter of the upper end hole. When the liquid level of the liquid refrigerant in the lower end hole is higher than the communication position where one end of the secondary throttling hole is connected with the lower end hole, the float ball is blocked between the upper end hole and the communication position to limit the liquid refrigerant in the motor cavity from flowing to the bearing cavity. The top shape of the lower end hole of the stepped hole is matched with the curved surface of the float, so that when the float floats to the top of the lower end hole, the surface of the float can fit on the curved surface.

2. The axial bearing cavity drainage structure of the dynamic pressure gas suspension centrifugal refrigeration compressor according to claim 1 is characterized in that: It also includes a plug, the lower end of the lower end hole exposes the exterior of the dynamic pressure gas suspension centrifugal refrigeration compressor, and the plug is sealed at the lower end of the lower end hole.

3. The axial bearing cavity drainage structure of the dynamic pressure gas suspension centrifugal refrigeration compressor according to claim 1 is characterized in that: The secondary throttling hole is a stepped hole, the inner diameter of the small hole end of the stepped hole is smaller than the inner diameter of the large hole end, the small hole end is connected to the lower end hole, and the inner diameter of the small hole end is smaller than the diameter of the float.

4. The axial bearing cavity drainage structure of the dynamic pressure gas suspension centrifugal refrigeration compressor according to claim 1 is characterized in that: It also includes an air return hole connected to the motor cavity, the air return hole is located on a side of the motor cavity close to the drainage channel, and the position where the air return hole connects to the motor cavity is lower than the second end of the drainage channel.

5. A dynamic pressure gas suspension centrifugal refrigeration compressor, characterized in that: It comprises the axial bearing cavity drainage structure of the dynamic pressure gas suspension centrifugal refrigeration compressor as described in any one of claims 1 to 4.

6. The dynamic pressure air suspension centrifugal refrigeration compressor according to claim 5, characterized in that: It also includes a casing, a first-stage impeller, a stepped shaft, a thrust plate, a first bearing body and a second bearing body; The first-stage impeller is installed on one side of the stepped shaft, the second bearing body is arranged between the housing and the first bearing body, the first bearing body is sleeved on the first-stage impeller, the bearing cavity is located between the first bearing body and the second bearing body, the thrust plate is located in the bearing cavity, the thrust plate and the second bearing body are both sleeved on the stepped shaft, the motor cavity is arranged in the housing, and the bearing cavity and the motor cavity are located between the second bearing body.

7. The dynamic pressure air suspension centrifugal refrigeration compressor according to claim 6, characterized in that: It also includes a motor stator and a motor rotor. The motor rotor is arranged on the stepped shaft. The motor rotor and the stepped shaft are integrally constructed. The motor stator is fixed in the shell, and both the motor stator and the motor rotor are located in the motor cavity.

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